Motorola IH5, MCPN750A manual Serial Port Signal Multiplexing Signal Multiplexing Iomx

Block Diagram

Serial

1

Serial

2

Serial

3

Serial

4

2

4

2

4

2

4

2

4

IOMX

Function

MXDO

MXSYNC#

MXCLK

MXDI

J3

Connector

6

Figure 6-2. Serial Port Signal Multiplexing

I/O Signal Multiplexing (IOMX)

There are four pins that are used for the IOMX function: MXCLK, MXSYNC#, MXDO, and MXDI. MXCLK is the 10 MHz bit clock for the time-multiplexed data lines MXDO and MXDI. MXSYNC# is asserted for one bit time at Time Slot 15 by the MCPN750A board. MXSYNC# is used by the transition module to synchronize with the MCPN750A board. MXDO is the time-multiplexed output line from the main board and MXDI is the time-multiplexed line from the transition module. A 16-to-1 multiplexing scheme is used with 10 MHz bit rate. Sixteen Time Slots are defined and allocated as follows:

http://www.motorola.com/computer/literature 6-17